Driving and operating195distance. The driver bears full
responsibility for maintaining safe
following distance according to
applicable traffic rules, weather
and road conditions etc. at all
times.
When the time to a potential collision
with a vehicle in front gets too small
and a collision is imminent, the
collision alert symbol pops-up in the
Driver Information Centre and the
driver gets notified by a warning
chime sound.
Depress the brake pedal and steer the vehicle, if it is required by the
situation.
Selecting the alert sensitivity
Press V or E to set the alert
sensitivity to near, medium or far and
on some versions off.
The first button press shows the
current setting on the Driver
Information Centre. Additional button
presses will change this setting. The
chosen setting will remain until it is
changed. The alert timing will vary
based on vehicle speed. The faster
the vehicle speed, the farther away
the alert will occur. Consider traffic
and weather conditions when
selecting the alert timing.Note that the alert timing sensitivity
setting is shared with the following
distance setting of the adaptive cruise control. So changing the alert timing
sensitivity changes the adaptive
cruise control following distance
setting.
Deactivation The system can be deactivated.
On forward collision alert with radar
sensor the system can be disabled by
the personalisation menu, 3 124.
Driving and operating197On Uplevel display, select Info menu
via steering wheel buttons and press
o to select following distance
indication 3 114.
The minimum indicated distance is 0.5 seconds.
If there is no vehicle ahead or the vehicle ahead is out of range, two
dashes will be displayed: -.- sec.
If Adaptive cruise control is active,
this page shows the alert sensitivity
setting instead of following distance
setting. 3 186.
Active emergency braking
Active emergency braking can help to reduce the damage and injury from
crashes with vehicles and obstacles
directly ahead, when a collision can no longer be avoided either by
manual braking or by steering. Before the active emergency braking
applies, the driver is warned by the forward collision alert 3 194.
The feature uses various inputs (e.g.
camera sensor, radar sensor, brake
pressure, vehicle speed) to calculate
the probability of a frontal collision.9 Warning
This system is not intended to
replace the driver responsibility for driving the vehicle and looking
ahead. Its function is limited to
supplemental use only to reduce
the vehicle speed before a
collision.
The system may not react for
pedestrians or animals. After a
sudden lane change, the system
needs a certain time to detect the
next preceding vehicle.
The driver shall always be ready to take action and apply the brakes
and steer to avoid collisions.
Functionality
If equipped only with front camera the active emergency braking operates in
forward gear above walking speed up to 53 mph.
With radar sensor active emergency
braking operates in forward gear
above walking speed at all speeds.
A precondition is that forward collision
alert with front camera system is not
deactivated by pressing V on the
steering wheel 3 194 or, with radar
sensor, that it is not deactivated in the
vehicle personalisation menu 3 124.
The system includes: ● brake preparation system
● emergency automatic braking
248Vehicle careNo.Circuit1Starter2Starter3Exhaust sensor4Engine control module5Engine functions/Aeroshutter6Transmission control module7Forward collision alert / Adap‐
tive Cruise Control8Engine control module9Climate control system10Diesel exhaust system11Tailgate locking system, Trans‐
mission12Seat lumbar massage13After boil pump14Diesel exhaust system15Exhaust sensor16Fuel injectionNo.Circuit17Fuel injection18Diesel exhaust system19Diesel exhaust system20–21–22ABS23Washer system for windscreen
and rear window24Washer Headlamp25Diesel fuel heating26Transmission control module27Power tailgate module28–29Heated rear window30Mirror defrost31Anti theft warning module
308IndexAAccessories and vehicle modifications .......................... 228
Active emergency braking ..........197
Adaptive cruise control .......113, 186
AdBlue ................................ 111, 168
Adjustable air vents ...................153
Airbag and belt tensioners .........108
Airbag deactivation ..............63, 108
Airbag label................................... 58
Airbag system .............................. 58
Air conditioning regular operation ................................ 154
Air conditioning system .............. 146
Air intake .................................... 154
Air vents...................................... 153
Antilock brake system ................ 177
Antilock brake system (ABS) .....110
Anti-theft alarm system ................36
Anti-theft locking system .............. 36
Appearance care ........................274
Armrest ................................... 53, 55
Armrest storage ........................... 72
Ashtrays ....................................... 98 Automatic anti-dazzle ..................41
Automatic light control ...............135
Automatic locking ........................29
Automatic transmission .............170
Autostop ..................................... 161
Auxiliary heater ........................... 153B
Battery discharge protection ......144
Battery voltage ........................... 123 Belts.............................................. 56
BlueInjection ............................... 168
Bonnet ....................................... 230
Brake and clutch fluid .................278
Brake and clutch system ...........109
Brake assist ............................... 180
Brake fluid .................................. 233
Brakes ............................... 177, 233
Breakdown.................................. 272
Bulb replacement ....................... 236
C Capacities .................................. 293
Cargo management system ........82
Catalytic converter .....................167
Central locking system ................24
Centre console lighting ..............143
Changing tyre and wheel size ...261
Charging system ........................ 109 Child locks ................................... 30
Child restraint installation locations ................................... 67
Child restraints.............................. 65
Child restraint systems ................65
Climate control ............................. 15
Climate control systems .............145
Clock............................................. 95
309CNG.................................... 104, 220
Control indicators........................ 107
Control of the vehicle .................156
Controls ........................................ 91
Convex shape .............................. 39
Coolant and antifreeze ...............278
Cruise control ....................113, 183
Cupholders .................................. 71
Curtain airbag system .................. 63
Curve lighting.............................. 136
D
Danger, Warnings and Cautions ...4
Daytime running lights ...............136
Declaration of conformity ............297
DEF ............................................ 168
Diesel exhaust fluid ....................168
Diesel fuel system bleeding .......235
Door open .................................. 114
Doors ............................................ 30
Driver assistance systems ..........183
Driver Information Centre ...........114
Driving characteristics and towing tips .............................. 223
Driving hints ................................ 156
E Electric adjustment ......................39
Electrical system......................... 246
Electric parking brake .........109, 178
Electric parking brake fault .........109Electronic climate control system 148
Electronic driving programmes . ........................................ 172, 176
Electronic key system ...................22
Electronic Stability Control.......... 181
Electronic Stability Control and Traction Control system ..........110
Electronic Stability Control off..... 110
End-of-life vehicle recovery .......229
Engine compartment fuse box ...247
Engine coolant ........................... 232
Engine coolant temperature gauge ..................................... 105
Engine data ............................... 286
Engine exhaust .......................... 166
Engine identification ...................282
Engine oil ................... 231, 278, 283
Engine oil pressure ....................111
Entry lighting .............................. 143
Event data recorders ..................304
Exhaust filter ....................... 111, 166
Exit lighting ................................ 143
Exterior care .............................. 274
Exterior light ............................... 112
Exterior lighting ....................12, 134
Exterior mirrors ............................. 39
F
Fault ................................... 172, 176
First aid kit ................................... 87Fixed air vents ........................... 153
Folding mirrors ............................. 39
Following distance ......................110
Following distance indication ......196
Forward collision alert................. 194
Front airbag system .....................62
Front fog lights ...........113, 140, 238
Front seats.................................... 47
Front storage ................................ 72
Fuel............................................. 218
Fuel for diesel engines ..............219
Fuel for natural gas operation ...220
Fuel for petrol engines ...............218
Fuel gauge ................................. 104
Fuel selector .............................. 104
Fuses ......................................... 246
G
Gauges ....................................... 102
Gear shifting ............................... 110
General information ...................223
Glovebox ..................................... 71
H Halogen headlights ....................236
Hand brake ......................... 177, 178
Hazard warning flashers ............139
Headlight flash ........................... 135
Headlight range adjustment ......135
Headlights................................... 134 Headlights when driving abroad 136